Add 2022 day 4

2022/4/Cargo.lock

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+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "common"
+version = "0.1.0"
+
+[[package]]
+name = "day4"
+version = "0.1.0"
+dependencies = [
+ "common",
+]

2022/4/Cargo.toml

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+[package]
+name = "day4"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+common = { path = "../common" }

2022/4/src/main.rs

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+use std::str::FromStr;
+
+fn main() {
+    let input_file = common::parse_args_input_file(&mut std::env::args());
+    let contents = std::fs::read_to_string(input_file).expect("Couldn't read contents of input file");
+    let mut contained = 0;
+    let mut overlapped = 0;
+    for line in contents.lines() {
+        if line.eq("") {
+            continue;
+        }
+        let split_line = line.split_once(",").expect("Line didn't contain a pair delimiter");
+        let left = split_line.0.split_once("-").expect("Left side didn't contain a range delimiter");
+        let right = split_line.1.split_once("-").expect("Right side didn't contain a range delimiter");
+
+        let lmin = u32::from_str(left.0).unwrap();
+        let lmax = u32::from_str(left.1).unwrap();
+        let rmin = u32::from_str(right.0).unwrap();
+        let rmax = u32::from_str(right.1).unwrap();
+
+        if (lmin >= rmin && lmax <= rmax) || (rmin >= lmin && rmax <= lmax) {
+            contained += 1;
+            println!("{}-{},{}-{}", lmin, lmax, rmin, rmax);
+        }
+
+        if (lmin > rmax) || (lmax < rmin) {
+            continue;
+        }
+        overlapped += 1;
+    }
+    println!("[PART 1] Pairs fully containing another: {}", contained);
+    println!("[PART 2] Pairs with any overlap: {}", overlapped);
+}